Need help choosing an ultrabook PC.

Which laptops would you consider if you were looking for an ultrabook? I know most of these were just recently announced, but if anyone can share their opinion on the reliability, build quality and hidden annoyances, I would really appreciate it.

I'm considering Acer S3 and Asus zenbook. So far the advantages I see in Acer's notebook are the price (-$100) and it has bigger 13.3" display compared to Asus's 11.6".